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Bug 1540667: Prior to commit c4329032, we were loading htdocs/artefact/internal/lib.php on *every* page load, via the login auth method's code that checked for missing internal artefact files. This call meant that we also loaded artefact/lib.php on every page load. Removing that for performance reasons, caused some calls to embeddedimages.php to fail, when they were on pages that aren't otherwise requiring artefact/lib.php. behatnotneeded: Can't use the image embedder from Behat Change-Id: Ibcdbd17d289f2b4614c28ad522173286acc9bc27
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